A numerical study on convection and diffusion of mass transfer in proton exchange membrane fuel cells with orientated‐type flow channels,International Journal of Energy Research

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A numerical study on convection and diffusion of mass transfer in proton exchange membrane fuel cells with orientated‐type flow channels
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-11-30 , DOI: 10.1002/er.6191
Hao Chen ₁ , Hang Guo ₁ , Fang Ye ₁ , Chong Fang Ma ₁

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The transfer processes of reactants and products affect each other in proton exchange membrane fuel cells (PEMFCs), because they have contrast transfer directions between flow channels and gas diffusion layers (GDLs). In this study, a two‐dimensional, two‐phase, non‐isothermal and steady state model is developed to analyze the species transportation behaviors through diffusion and convection in PEMFCs with orientated‐type flow channels. Five conventional shape baffles effects on mass transfers are compared, and the relationships between convection and diffusion of reactants and produced water vapor are discussed. Simulation results reveal that baffle shapes affect the mass transportation through the baffles leading angles and volumes, and larger leading angles enhance the reactants and the water vapor convective transferring into GDLs; meanwhile, larger baffle volumes enhance the reactant transferring into GDLs and water vapor transferring out from GDLs through diffusion processes. In addition, transportation processes of reactants and vapor affect each other, where more reactants convectively transferring into GDLs causes more water vapor entering GDLs; enhancing the reactants diffusively transferring into GDLs reduces water vapor diffusive transportation out from GDLs.

中文翻译：

定向流道质子交换膜燃料电池传质对流和扩散的数值研究

反应物和产物的转移过程在质子交换膜燃料电池（PEMFC）中相互影响，因为它们在流道和气体扩散层（GDL）之间具有对比转移方向。在这项研究中，建立了二维，两相，非等温和稳态模型，以分析具有定向流道的PEMFC中通过扩散和对流进行的物种迁移行为。比较了五个传统的形状挡板对传质的影响，并讨论了反应物的对流和扩散与产生的水蒸气之间的关系。仿真结果表明，导流板的形状会影响导流板通过导流角和体积的传质，较大的导流角会增强反应物和水蒸气的对流传递到GDL中。同时，较大的挡板体积会增强反应物通过扩散过程转移到GDL中以及水蒸气从GDL中转移出来的能力。另外，反应物和蒸气的传输过程相互影响，更多的对流通过对流转移到GDL中，导致更多的水蒸气进入GDL。增强反应物以扩散方式转移到GDL中会减少水蒸气从GDL中扩散扩散出来。

更新日期：2020-11-30

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